the r.M.S. Velocity of the molecules in the sample of helium is 5/7th that of the molecules in the sample of hydrogen. If the temperature of the hydrogen sample is 0c that of helium is
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Vrms = √3RT/M
Vrms(H) =√3R273/2
Vrms(He) = √3RT/4
Vrms(He) =5/7 Vrms(H)
√3RT/4 =5/7 { √3R273/2 }
T/4 = 25/49 {273/2}
T=278.57 K
= 5.57 C Ans.
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